Description
📌 FANUC A20B-3300-0311 — CPU Module (32 MB DRAM)
Part: FANUC A20B-3300-0311
Type: Pentium-based CPU board with 32 MB DRAM
Used In: FANUC Series 16i-B and 18i-B CNC controller systems (older “B-series” CNCs)
🧠 What It Is
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This is a CPU printed circuit board used inside a FANUC CNC controller.
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It features a Pentium processor and 32 MB of DRAM, providing the main computing power for control tasks like program execution, motion control, logic, and communication with I/O, drives, and other CNC modules.
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It’s typically used as a sub-CPU board plugged into a main controller chassis (e.g., A20B-3200 or similar fans).
⚙️ Key Functions
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🛠️ Processing: Executes CNC control software and handles real-time control tasks.
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📊 Memory: The 32 MB DRAM helps the board buffer instructions, programs, and data being processed by the controller.
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🤖 Compatibility: Commonly fits FANUC Series 16i-B and 18i-B controller architectures — older models used on many milling machines, lathes, and machining centers.
📍 Notes & Practical Points
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⚠️ If you replace this module in a CNC controller, stored data (parameters/programs) may be lost and will usually need restoring from backup.
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📦 It’s often sold new surplus, refurbished, or repaired by third-party suppliers.
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🧩 This board works alongside other PCBs in the controller — power supply, main board, I/O cards, display interface, etc.